Method for Automatically Mapping Smart Plug and Electronic Device Connected Thereto in Home Gateway and Device Therefor

1. A method for a home gateway to map a smart plug to a first electronic device connected to the smart plug automatically, the method comprising: receiving data from the smart plug, the data including power information; checking, in response to receiving the power information, whether previously stored mapping information between the smart plug and a second electronic device in a mapping table is correct; deleting at least part of the mapping table which includes correspondency between the smart plug and the second electronic device; receiving a state change notification signal from the first electronic device; and newly mapping, when the state change notification signal is received from the first electronic device in a predetermined time period, the smart plug and the first electronic device based on the data received from the smart plug and the state change notification signal received from the first electronic device.

2. The method of claim 1 , further comprising displaying, when the first electronic device and the smart plug are mapped completely, information indicating that the smart plug and the first electronic device are mapped completely.

3. The method of claim 1 , further comprising suspending, when the state change notification signal is not received in the predetermined time, connection of the smart plug.

4. The method of claim 3 , further comprising mapping automatically based on information received from respective electronic devices in response to a signal transmitted to all electronic device to command all registered electronic device to report on/off information, based on an on-state signal reported periodically by the electronic device, or based on the state change notification signal retransmitted by an electronic device from which no acknowledgement signal is received.

5. The method of claim 1 , wherein the power information comprises at least one of instantaneous power information and accumulative power information connected to the smart plug.

6. The method of claim 1 , further comprising storing the automatically mapped data.

7. The method of claim 6 , further comprising storing information on date when automatic mapping is updated along with the automatically mapped data.

8. A home gateway for mapping a smart plug and an electronic device connected thereto, the home gateway comprising: a gateway communication unit capable of communicating with at least one smart plug and at least one electronic device; a display unit for displaying status of the home gateway and mapping state between the smart plug and the electronic device; a memory unit for storing identity information and power consumption information of all registered electronic devices and mapping information of the smart plug connected to the respective electronic devices; and a control unit which receives data from the smart plug, the data including power information, checks, in response to receiving the power information, whether previously stored mapping information between the smart plug and a second electronic device in a mapping table is correct, deletes at least part of the mapping table which includes correspondency between the smart plug and the second electronic device, receives a state change notification signal from the first electronic device, and newly maps, when the state change notification signal is received from the first electronic device in a predetermined time period, the smart plug and the first electronic device based on the data received from the smart plug and the state change notification signal received from the first electronic device.

9. The home gateway of claim 8 , wherein the control unit controls displaying, when the first electronic device and the smart plug are mapped completely, information indicating that the smart plug and the first electronic device are mapped completely.

10. The home gateway of claim 8 , wherein the control unit suspends, when the state change notification signal is not received in the predetermined time, connection of the smart plug.

11. The home gateway of claim 10 , wherein the control unit controls the communication unit to transmit to all registered electronic devices a signal commanding to report on/off information and performs mapping automatically based on information received from respective electronic devices in response to a signal transmitted to all electronic device, based on an on-state signal reported periodically by the electronic device, or based on the state change notification signal retransmitted by an electronic device from which no acknowledgement signal is received.

12. The home gateway of claim 8 , wherein the power information comprises at least one of instantaneous power information and accumulative power information connected to the smart plug.

13. The home gateway of claim 8 , wherein the control unit controls the memory unit to store the automatically mapped data.

14. The home gateway of claim 13 , wherein the control unit controls the memory unit to store information on date when automatic mapping is updated along with the automatically mapped data.